The indicated circuit uses an unusual buffer from National Semiconductor. The frequency is given by resistors R1 and R2 as well as capacitors C1 and C2.
This circuit was found in a Popular Electronics from April 1993. It is a voltage regulator circuit for...
This amplifier allows you to recover recorded tapes from a tape player that has the mechanism in...
Found in a 90s Electronic Design, this circuit produces adjustable pulses that start after an...